Second-half goals from Peter Leven, Mark Wright and Jemal Johnson earned a sixth successive victory for the Dons and ensured they remain a point behind the Foxes at the top of the table.
To complete a miserable night for the Bulls they saw on-loan Wolves goalkeeper Matt Murray carried off with a knee injury.
Leven opened the scoring from the penalty spot in the 58th minute after Karl Broadhurst bundled over Miguel Llera.
The second arrived five minutes later when Sam Baldock picked out Wright’s run to the near post and the winger smashed home emphatically.
Johnson put the gloss on the win two minutes from time with a mazy run and shot that beat substitute goalkeeper Craig Samson.